New carrier sim not working on iphone 4

Hi there,
I just changed my network (carrier) and the new SIM is not being recognised in my iPhone 4. The contract with previous provider (O2) had expired. Updated my iTunes and it said that iPhone would not support new SIM. How can I get it to move on to my new SIM (with Vodafone)? All suggestions welcome!
Many thanks
Gus

Just because your contract was up does not mean you can just put a different carrier's SIM in it and go. You will have to contact O2 to have the phone unlocked. ONLY the carrier the phone is locked to can authorize unlocking it. There is usually a charge involved.
According to this list: http://support.apple.com/kb/ht1937 O2 does offer unlocking.

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